just last year the former chicago bears safety dave deurson requested that his brain be donated to science to study the long-term effects of concussions. that was before investigators say he shot himself in the chest. and the scientists who examined deurson's brain as well as junior. researches at boston university report they investigated brain samples from 85 people all of whom had histories of brain injuries. they claim 80% of those brains showed signs of a certain type of brain disease that cause memory loss, depression and dementia. almost all of those brains they say belong to athletes. but scientist its say they don't have enough evidence to prove that the hits on the field caused the brain disease. earlier today on "studio b," a doctor suggested we have reached a point where parents really should think twice before even allowing their kids to play football. >> parents that are watching today need to be highly suspicious and highly cautious about having their kids participate in high school football, either if they don't get the right test done, if they are not followed frequently a